1242459677 has 2 divisors, whose sum is σ = 1242459678. Its totient is φ = 1242459676.

The previous prime is 1242459661. The next prime is 1242459679. The reversal of 1242459677 is 7769542421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815045401 + 427414276 = 28549^2 + 20674^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242459677 - 2⁴ = 1242459661 is a prime.

Together with 1242459679, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242459679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621229838 + 621229839.

It is an arithmetic number, because the mean of its divisors is an integer number (621229839).

Almost surely, 2^1242459677 is an apocalyptic number.

It is an amenable number.

1242459677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242459677 is an equidigital number, since it uses as much as digits as its factorization.

1242459677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 47.

The square root of 1242459677 is about 35248.5414875566. The cubic root of 1242459677 is about 1075.0469572421.

The spelling of 1242459677 in words is "one billion, two hundred forty-two million, four hundred fifty-nine thousand, six hundred seventy-seven".